JPH0719813U - Inspection disc - Google Patents

Abstract

(57) [Summary] [Object] An object of the present invention is to provide an inspection disk formed so as to efficiently inspect and adjust the reproducing ability of a reproducing apparatus. [Structure] The disc 1 for inspection has a boundary line 2 on the recording surface 1e.
A first area 3 in which a music signal recording track is provided is formed further inside, and a second area 4 in which a sine wave signal recording track is provided is formed outside the boundary line 2. First
In the area 3 of FIG. 3, the interruption 6, the black band 7 and the fingerprint 8 are sequentially formed from the inside to the outside, and in the second area 4, the interruption 6 ′, the black band 7 ′ and the fingerprint are formed from the inside to the outside. 8'is formed in order. Therefore, the first region 3 and the second region 4 can be independently selected, and the sine wave signal is not reproduced during the auditory inspection.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an inspection disc, and more particularly, to an inspection disc used for inspecting and adjusting a reproducing ability of a reproducing device in which a disc as a recording medium is mounted.

[0002]

[Prior art]

 For example, on the recording surface of a compact disc, various physical defects such as black spots, dirt adhering to the disc surface, dust or fingerprints, missing information layer (pit surface), scratches, etc. may occur on the recording surface of the compact disc. There is.

In order to measure the reproducing ability of the compact disc player for such defects of the disc, a compact disc player assembled in a factory or the like reproduces an inspection disc in which the above defects are artificially provided in the inspection process. , The reproduction capability is checked and adjusted based on the reproduction signal.

This type of inspection disk is provided with the following defect pattern (defect pattern). Interruption: A defect pattern for simulating missing information layer (pit surface) and scratches. Black band: A defect pattern for simulating black spots formed during disk molding and dirt, dust, etc. adhering to the disk surface. Fingerprint: A defect pattern for simulating fingerprints on the disk surface.

Usually, a music signal is recorded as a recording signal on the inspection disk, but some discs include not only a music signal but also a sine wave signal.

On such an inspection disc, a music signal recording track on which a music signal is recorded and a sine wave signal recording track on which a sine wave signal is recorded are alternately formed. When a disc for recording is mounted and continuously played back, the music signal recording track is played back, the sine wave signal recording track is played back, and then the next music signal recording track is played back. The track and the sine wave signal recording track are reproduced alternately.

The inspector mounts the above-mentioned inspection disc on the assembled compact disc player, and the reproduced music signal is aurally sensed by using a headphone or the like to detect the defect pattern formed on the inspection disc by the compact disc player. The compact disc player is used to inspect and adjust the reproducing ability, or to electrically measure the reproduced sine wave signal using a waveform measuring instrument such as an oscilloscope to detect the defect pattern formed on the inspection disc. The reproduction ability was inspected and adjusted.

[0008]

[Problems to be solved by the device]

 Thus, when inspecting the reproducing ability of the compact disc player, the inspection disc having the pseudo defect pattern as described above is used, and the reproducing ability of the compact disc player is reproduced by reproducing the pseudo defect pattern. Can be simulated. Then, when the inspector visually inspects the reproduced music signal, the inspector checks whether an abnormality occurs when the pseudo defect pattern is reproduced, and the inspector checks the music signal recorded with the desired music. The recording track is specified by the address number.

However, when the reproduction capacity of a compact disc player is inspected using a conventional inspection disc, music signal recording tracks and sine wave signal recording tracks are alternately recorded on the inspection disc. Therefore, the sine wave signal recording track may be reproduced while the music signal recording track is being reproduced and being inspected by hearing. At that time, the inspector will hear annoying high-pitched sounds such as "pee."

Therefore, conventionally, in order to prevent the playback sound of the sine wave signal recording track from being heard, the address number of only the music signal recording track must be specified before the inspection, which is a troublesome setting operation. There is a problem such as.

Further, for the inspector, each time he or she hears the reproduced sound which is offensive to the ears, he or she feels uncomfortable and carries out the inspection work, and the work efficiency is lowered each time.

Therefore, an object of the present invention is to provide an inspection disk that solves the above problems.

[0013]

[Means for Solving the Problems]

 The present invention is formed so as to intersect a music signal recording track on which a music signal is recorded, a sine wave signal recording track on which a sine wave signal is recorded, the music signal recording track and the sine wave signal recording track. And a pseudo defect portion on the recording surface, wherein the recording surface has a plurality of recording tracks including the music signal recording tracks except the sine wave signal recording tracks. Forming a second region in which a plurality of recording tracks including the sine wave signal recording track except at least the music signal recording track are provided in a portion other than the first region of the recording surface, The pseudo defect portion is formed in each of the first region and the second region.

[0014]

[Action]

 A first area in which at least a plurality of music signal recording tracks are provided on the recording surface of the inspection disk, and a second area in which at least a plurality of sine wave signal recording tracks are provided in a portion other than the first area on the recording surface. By forming the areas separately, it is possible to easily set each area to be played back independently, and for example, when auditioning by hearing, the music signal recording track recorded in the first area is recorded. If specified, it is possible to prevent the sine wave signal from being reproduced while the music signal is being reproduced.

[0015]

【Example】

 1 to 3 show an embodiment of an inspection disk according to the present invention.

In each figure, the inspection disc 1 is used by being mounted at a predetermined reproduction position of the compact disc player when the reproduction capability of the compact disc player (not shown) is inspected. This inspection disk 1 is manufactured to have the same size as a commonly used compact disk. The upper surface is an information reading surface 1a and the lower surface is a title printing surface 1b on which a title is printed. The disc 1 for inspection has a reflective film 1d formed by vapor-depositing aluminum on the lower surface of a disc 1c made of polycarbonate resin on the recording surface 1e, and a protective film 1f made of synthetic resin is bonded to the lower surface of the recording surface 1e. Has been done.

The recording surface 1 e of the inspection disk 1 has a circle formed at a substantially middle position in the radial direction as a boundary line 2, and a plurality of music signal recording tracks are provided inside the boundary line 2. A region 3 is formed, and a second region 4 having a plurality of sinusoidal signal recording tracks provided outside the boundary line 2 is formed.

In the first area 3, for example, 13 pieces of different classical music (address numbers 1 to 13) are recorded for 1 minute 30 seconds each. In the second area 4, sine wave signal recording tracks are formed at address numbers 14 to 43, and sine wave signals of 1 KHz and 10 KHz, for example, are recorded for 30 seconds on the recording tracks of address numbers 14 to 43. Alternately recorded.

Further, a defect pattern (defect pattern) 5 as a pseudo defect portion is formed on the reading surface 1a and the recording surface 1e of the inspection disk 1. The defect pattern 5 extends in the radial direction so as to intersect the recording tracks recorded in the first area 3 and the second area 4, and is formed in each area.

In the defect pattern 5, an interruption 6, a black band 7, and a fingerprint 8 are sequentially formed from the inner side to the outer side in the first area 3, and the interruption 6 is formed from the inner side to the outer side in the second area 4. Option 6 ', black band 7', and fingerprint 8'are formed in order.

The interruption 6 is a defect pattern for simulating the missing of the information layer (pit surface) formed on the recording surface 1e, scratches, and the like. The information layer (pit surface) is scratched to form an uneven pattern. I'm crushing.

The black band 7 is a defect pattern for simulating black spots formed at the time of disk molding and dirt, dust, etc. attached to the disk surface. A black film is printed on the reading surface 1 a of the inspection disk 1. ing.

The fingerprint 8 is a defect pattern for simulating a fingerprint attached to the disk surface, and a black coating is printed on the reading surface 1 a of the inspection disk 1 like the black band 7.

Therefore, the first area 3 in which the music signal is recorded is formed inside the recording track which overlaps the fingerprint 8 printed at the intermediate position of the reading surface 1 a, and the sine wave is formed outside the first area 3. The wave signal is recorded.

The interruption 6 formed in the first area 3 is provided at a position intersecting with the music signal recording tracks of address numbers 2 to 7, and the width dimension in the circumferential direction is the same at the same address number. Equally, it becomes wider gradually as the address number increases.

That is, the width of the interrupt 6 in the circumferential direction becomes wider stepwise as it moves from the inside to the outside.

The black band 7 formed in the first region 3 has a shape similar to that of the interruption 6 and is provided at a position intersecting with the music signal recording tracks of address numbers 8 to 12. Therefore, the black band 7 has a shape in which the width dimension in the circumferential direction is the same at the same address number, and becomes wider stepwise as the address number increases.

The fingerprint 8 formed in the first area 3 is provided at a position intersecting the music signal recording track with the address number 13. The width of the fingerprint 8 in the circumferential direction is constant.

Next, the interruption 6 ′ formed in the second area 4 is provided at a position intersecting the sine wave signal recording tracks of address numbers 16 to 29, and has the same width in the circumferential direction. The even number and the next odd number are equal, and the shape is gradually increased as the address number increases (that is, even number).

The black band 7 ′ formed in the second region 4 has a shape similar to that of the interruption 6 ′ and is provided at a position intersecting with the sine wave signal recording tracks of address numbers 30 to 41. ing. Therefore, the black band 7'has a shape in which the width dimension in the circumferential direction gradually increases for each even number.

The fingerprint 8'formed in the second area 4 is provided at a position intersecting the sine wave signal recording tracks with the address numbers 42 to 43. The width of the finger print 8'in the circumferential direction is constant.

In a factory for assembling a compact disc player, the compact disc player, which has been assembled in the inspection process, is loaded with the above-mentioned disc 1 for inspection and the reproduction capability is inspected and adjusted. At that time, the inspector auditorily checks the state of skipping due to a defect in the reproduced signal.

In that case, an arbitrary number is designated from the address numbers 2 to 13 of the music signal recorded in the first area 3 of the disc 1 for inspection, and the reproduced sound is reproduced by headphones or the like. While listening to, adjust the sensitivity of the circuit that removes noise, and check whether track deviation occurs.

Further, when electrically measuring using a waveform measuring device, an arbitrary number is selected from the address numbers 16 to 43 of the sine wave signal recorded in the second area 4 of the inspection disk 1. Play by specifying and check the change in the playback signal waveform.

As described above, since the first area 3 of the music signal and the second area 4 of the sine wave signal are separately recorded on the inner side and the outer side of the boundary line 2 on the inspection disk 1. When testing the playback capacity of a compact disc player using the disc 1 for inspection, it is possible to hear by specifying the address number of the first region 3 of the music signal or the second region 4 of the sine wave signal. It is possible to easily support inspections or inspections using waveform measuring instruments.

Moreover, since the first region 3 and the second region 4 are formed with the interruptions 6 and 6 ′, the black bands 7 and 7 ′, and the fingerprints 8 and 8 ′, respectively, independently of each other, they are audible. The inspection and the inspection using the reproduced signal waveform can be performed independently. For example, there is a disadvantage that a sine wave signal is suddenly reproduced during an auditory inspection as in the conventional case, and an unpleasant reproduced sound is heard. Instead, it is possible to eliminate the inconvenience that the inspection work is performed while feeling the discomfort each time the audible playback sound is heard, and the work efficiency is reduced. Therefore, when performing an auditory inspection, it is possible to prevent annoying playback sound from being heard, and to prevent a sine wave signal from being reproduced during an auditory inspection like a conventional inspection disk. This eliminates the need for troublesome track designation operations and enables efficient inspection.

In addition, the patterns of the interruptions 6 and 6'and the black bands 7 and 7'have a shape in which the width in the circumferential direction is increased stepwise, and the switching positions of the widths are positioned between the tunes. It is provided in. Therefore, since the width of the defect pattern in the circumferential direction is constant within the same song, it is possible to check with the same circumferential width of the defect pattern anywhere in the same song, without specifying the recording track position one by one. However, the defect pattern of each width dimension can be checked in stages.

In the above embodiment, the inspection disk for inspecting the reproducing ability of the compact disk player is given as an example, but the present invention is not limited to this, and the reproducing ability of a magneto-optical disk device using an optical pickup is inspected. Of course, it can also be applied to the inspection disk.

Further, in the above embodiment, the first area 3 of the music signal and the second area 4 of the sine wave signal are formed on one inspection disk. However, the present invention is not limited to this, and the third area may be used, for example. The region or the fourth region may be provided so as to be shifted in the radial direction.

Further, instead of recording a music signal in the first area 3, a silent band may be formed so that noise at the time of reproducing a defective pattern can be visually checked.

Instead of recording the sine wave signal in the second area 4, a random noise pattern that is not regularized may be formed and the waveform of the reproduction signal may be checked.

[0042]

[Effect of device]

 As described above, the inspection disk according to the present invention has the first area where at least a plurality of music signal recording tracks are provided on the recording surface of the inspection disk, and the area other than the first area on the recording surface. Since at least the second area having a plurality of sine wave signal recording tracks is formed separately and an independent pseudo defect portion is formed in each area, each area can be reproduced independently. It is possible to set easily. For example, if the music signal recording track recorded in the 1st area is specified at the time of auditory inspection, a sine wave signal is suddenly reproduced while the music signal is being reproduced. Can be prevented. Therefore, it is possible to eliminate the inconvenience that the inspection work is performed while feeling the discomfort each time the audible reproduction sound is heard, and the work efficiency is reduced. Also, in order to prevent the sine wave signal from being reproduced during an auditory inspection like a conventional inspection disk, it is not necessary to perform a troublesome track designation operation, and the inspection is performed efficiently. It has features such as being able to.

[Brief description of drawings]

FIG. 1 is a plan view of an embodiment of an inspection disk according to the present invention.

FIG. 2 is an enlarged plan view showing a defect pattern formed on an inspection disk.

FIG. 3 is a vertical cross-sectional view showing an enlarged inspection disk.

[Explanation of symbols]

 1 Inspection Disk 2 Boundary 3 First Area 4 Second Area 5 Defect Pattern 6,6 'Interruption 7,7' Black Band 8,8 'Fingerprint

Claims (1)

[Scope of utility model registration request] 1. A music signal recording track on which a music signal is recorded, a sine wave signal recording track on which a sine wave signal is recorded, and the music signal recording track and the sine wave signal recording track are formed so as to intersect with each other. And a pseudo defect portion formed on the recording surface of the inspection disk, the recording surface having a plurality of recording tracks including the music signal recording track except the sine wave signal recording track. Forming a second region in which a plurality of recording tracks including the sine wave signal recording track except at least the music signal recording track are provided in a portion other than the first region of the recording surface, An inspection disk having the pseudo defect portion formed in each of the area 2 and the area 2.